Dynamo-electric machine.



H. H. RALSTUN. DYNAMO ELECTRIC MACHINE. APPLICATION FILED SBPT.14, 1905.

Patented N 0V. 28, 1911.

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fammi/f. 22a zum UNITED sTATEs PATENT OFFICE.

l HOWARD H. RALSTON, F NORWOOD, HIOQASSIGNOR TO THEBULLOCK ELECTRIC MANUFACTURING COMPANY,l A CORPORATION 0F OHIO.

DYNAMO-ELECTRIC MACHINE.

Specification of'Letters Patent. Patented NOV. 28, 1911.

Application led September 14, 1905. v.Serial No. 278,488.

' saidl machines and the connections between the commutator segments and armature coils. y v.

It is essential in. making the connection between the commutator segments and the armature coils to secure perfectelectrical contact and a Aconsiderable. degree of me c-hanical strength'.

The object of my invention is therefore to simplifythe method of making these con-': nections and to minimize the liability of the commutator segments and connections pulling apart during the operation of the machine. T Y

In carrying out my invention I perforate one end of the segment and force a part of the material ofthe connector into the per. foration, whereby the segment and connector will be securely held together.

My invention further consists in the combination of a segment having a radial slot or recess and one or more lateral 'openings or perforations, and a connector seated in said slot or recess and having `a portion of its material 'forced into the opening or/openings.

In another aspect my invention comprises the -method of fastening the commutator connector to the commutator segment, which method consists in slotting or recessing the end of thesegment and perforating said slotted or recessed end, placingthe connector in the slot or recess and forcing a part of the material of the connector into the perforaI tion ory perforations of the segment.

yIn* the accompanying drawings which illustrate my invention, Figure 1 vis an elevation partially in section; of an armature equipped with my invention; Fig. y2 is a aitial elevation of a segment showing my' improved connecting means;v Fig. 3 is a section* along the tine 3-3 of Fig. 2;? Fig. 4 is a view similar Fig. 2, showing 'a modification; F is a section along the `line 5-.- 5

. able extent.

of Fig. 4t; Fig. 6 is a View similar to Fig. 2,

showing a second modification; Fig. 7 is a the armature 15 is provided with a lami- 55 nated core 16, and armature coils 17 connected to the segments 18 of the commutator mounted in frame 19, which frame is fastened to the shaft 20 in the customary manner. Each commutator segment is perforated at one end and the end is also sau/ed or otherwise slotted on a radial plane, the slot being of a width just sutlicient to admit the connector.l

The connector consists preferably oftwofiatstrips of goodv conducting material 'side by side as shown at 21 in Figs. 8, 7 and 10, or it may consist of a single strip of metal as shown at 22 in Fig. 5. After the eonnector is placed in position in the t formedxin the commutator segment, a suitalole die or embossing tool is inserted in the perforation at one side of the segment and the material of the connector is forcedin'to the connector, forcing the material into the vsegment and against the walls of the perforation as shown at 24 in Fig. 5. In either case the metal of the connector is sulliciently displaced or forced out of the plane of the slot so that the parts will be securely held together.

The number and shape of the pcrforationf-1 in the segment may be varied to a consider-- I prefer two circular perforations as are shown at 25 in Figs. 2,3, 4l and v5. In Fig. 6 I have shown at 2G a single squareor rectangular perforation; 1n 3 a single oval shaped perforation 27; and in 3.05

lFig. 9 a single circular perforation 28.

modifications which do not depart from the spirit of' my invention.

Having thus described my invention, what AIv claim as new and desire to secure by Let- 2. In combination, commutator segmentA having a radial slotor recess and one or more lateral perforations or openings, and

a connector fitting tightly in said slot or recess and having a projection or lug which fits into each lateral of the segment.

3. In combination, a coxnlnutator segment havin cofradial slot or recess and one or more ateral perforations or openings, and a connector fitting tightly in the slot or recess 25 and having a part of its material embossed or spread into said lateral opening or openings in the Segment. v l

In testimony whereof I affix in v signature. in the presence of two Witnesse.

HOWARD H. RALSTON. Witnesses:

ARTHUR F. Kwis, AFRED KINSEY.

Copies of this patent may be obtained for ve cents each, 4by addressing the Commissioner of Patents. Washington, D. C.

ertoration or o aenino :2o 

